I have to wonder what’s going on here. We are talking about 2 accounts at German banks, which the tax office and also the court can look at, block, or seize if necessary. This is not about one spouse having an anonymous account in Switzerland...
On the other hand, it is naive to think a joint account protects the woman raising the children. Such an account can be emptied in no time and the money transferred to Switzerland...
By the way, besides the Düsseldorfer Tabelle, which is for the children, there is also a Bremer Tabelle that regulates pension claims. If the woman enforces that during the divorce, the average-earning ex-husband often has nothing left but the subsistence minimum…
So, basically, no one can really complain. The woman gets money for the children and the pension, and the man wanted the children too and has to pay... he can also deduct the payments from his taxes.